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SERVICE MANUAL
DA
TA
CD STEREO SYSTEM
NSX-R81
S/M Code No. 09-025-455-1N2
EZ(S)
BASIC TAPE MECHANISM : 6ZM-3 PR4NM
BASIC CD MECHANISM : BZG-5 ZD5GNDM
If requiring information about the CD mechanism, see Service Manual of
BZG-5 ZD5GNDM, (S/M Code No. 09-023-353-3NC).
NSX-R81
SPEAKER
SYSTEM
CD
CASSEIVER
CX-NR81
REMOTE
CONTROLLER
RC-CAS01
SX-NR80


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-2-
SPECIFICATIONS ............................................................................................................................................................... 3
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING ......................................................................4
NOTE ON BEFORE STARTING REPAIR ................................................................................................................... 5, 6
ACCESSORIES PARTS LIST .............................................................................................................................................. 7
ELECTRICAL PARTS LIST ....................................................................................................................................... 8 ~ 23
TRANSISTOR ILLUSTRATION ........................................................................................................................................ 24
SCHEMATIC DIAGRAM -1/5 (MAIN-1/2, AMP SECTION) ............................................................................................... 25
SCHEMATIC DIAGRAM -2/5 (MAIN-2/2, TUNER SECTION) .......................................................................................... 26
SCHEMATIC DIAGRAM -3/5 (HP SECTION) ................................................................................................................... 27
WIRING -1/4 (MAIN C.B, HP C.B) ..................................................................................................................................... 28
SCHEMATIC DIAGRAM -4/5 (FRONT/DECK/CD-LED SECTION) ................................................................................. 29
WIRING -2/4 (FRONT C.B/CD-LED C.B) .......................................................................................................................... 30
WIRING -3/4 (DECK C.B/HEAD-1 C.B) ............................................................................................................................. 31
SCHEMATIC DIAGRAM -5/5 (POWER SECTION) .......................................................................................................... 32
WIRING -4/4 (POWER C.B) ............................................................................................................................................... 33
ELECTRICAL ADJUSTMENT .................................................................................................................................... 34 ~ 40
CD TEST MODE ................................................................................................................................................................ 41
LCD DISPLAY ............................................................................................................................................................ 42 ~ 43
IC BLOCK DIAGRAM ....................................................................................................................................................... 44
IC DESCRIPTION ..................................................................................................................................................... 45 ~ 46
MECHANICAL EXPLODED VIEW .................................................................................................................................. 47
MECHANICAL PARTS LIST ............................................................................................................................................ 48
COLOR NAME TABLE ..................................................................................................................................................... 49
TAPE MECHANISM EXPLODED VIEW <6ZM-3 PR4NM> ........................................................................................... 50
TAPE MECHANISM PARTS LIST <6ZM-3 PR4NM> ............................................................................................. 51 ~ 52
GENERAL SPEAKER DISASSEMBLY INSTRUCTIONS (FOR REFERENCE) ........................................................... 53
SPEAKER PARTS LIST (SX-NR80) ................................................................................................................................ 54
OTHER PARTS LIST ............................................................................................................................................... 55 ~ 56
TABLE OF CONTENTS -1/1


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-3-
SPECIFICATIONS -1/1
MAIN UNIT CX-NR81
TUNER
FM tuning range
87.5 MHz to 108 MHz
FM usable sensitivity (IHF)
16.8 dBf
FM antenna terminal
75 ohms (unbalanced)
MW tuning range
531 kHz to 1602 kHz (9 kHz step)
530 kHz to 1710 kHz (10 kHz step)
MW usable sensitivity
350
µV/m
LW tuning range
144 kHz to 290 kHz
LW usable sensitivity
1400
µV/m
MW/LW antenna
Loop antenna
AMPLIFIER
Power output
Rated: 80 W + 80 W (6 ohms, T.H.D.
1 %, 1 kHz/DIN 45500)
Reference: 100 W + 100 W (6 ohms,
T.H.D. 10 %, 1 kHz/DIN 45324)
DIN MUSIC POWER: 220 W + 220 W
Total harmonic distortion
0.08 % (40 W, 1 kHz, 6 ohms, DIN
AUDIO)
Input
VIDEO/AUX: 700 mV
Outputs
SPEAKERS: 6 ohms or more
CD DIGITAL OUT (OPTICAL)
PHONES: 32 ohms or more
CASSETTE DECK
Track format
4 tracks, 2 channels stereo
Frequency response
50 Hz - 15 kHz
Recording system
AC bias
Heads
DECK 1: playback x 1
DECK 2: recording/playback x 1,
erase x 1
CD PLAYER
Laser
Semiconductor laser (
= 780 nm)
D/A converter
1 bit dual
Signal-to-noise ratio
85 dB (1 kHz, 0 dB)
Harmonic distortion
0.05 % (1 kHz, 0 dB)
GENERAL
Power requirements
230 V AC, 50 Hz
Power consumption
110 W
Power consumption
With ECO mode on: 0.6 W
in standby mode
With ECO mode off: 20 W
Dimensions (W x H x D)
260 x 324 x 360 mm
Weight
7.8 kg
FRONT SPEAKERS SX-NR80
Speaker system
4 way, Built-in subwoofer (magnetic
shielded)
Speaker units
Subwoofer: 160 mm cone
Mid range: 80 mm cone
Tweeter: 50 mm cone
Super tweeter: 20 mm ceramic
Impedance
6 ohms
Dimensions (W x H x D)
266 x 324 x 259 mm
Weight
5.7 kg
· Specifications and external appearance are subject to change
without notice.


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-4-
This set employs laser. Therefore, be sure to follow carefully the
instructions below when servicing.
WARNING!!
WHEN SERVICING, DO NOT APPROACH THE LASER
EXIT WITH THE EYE TOO CLOSELY. IN CASE IT IS
NECESSARY TO CONFIRM LASER BEAM EMISSION. BE
SURE TO OBSERVE FROM A DISTANCE OF MORE
THAN 30cm FROM THE SURFACE OF THE OBJECTIVE
LENS ON THE OPTICAL PICK-UP BLOCK.
Caution: Invisible laser radiation when
open and interlocks defeated avoid
exposure to beam.
Advarsel: Usynlig laserståling vedåbning,
når sikkerhedsafbrydere er ude af funktion.
Undgå udsÊttelse for stråling.
VAROITUS!
Laiteen Käyttäminen muulla kuin tässä käyttöohjeessa
mainitulla tavalla saataa altistaa käyt-täjän
turvallisuusluokan 1 ylittävälle näkymättömälle
lasersäteilylle.
VARNING!
Om apparaten används på annat sätt än vad som
specificeras i denna bruksanvising, kan användaren
utsättas för osynling laserstrålning, som överskrider
gränsen för laserklass 1.
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING -1/1
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herin may result in
hazardous radiation exposure.
ATTENTION
L'utillisation de commandes, réglages ou procédures autres
que ceux spécifiés peut entraîner une dangereuse
exposition aux radiations.
ADVARSEL
Usynlig laserståling ved åbning, når sikkerhedsafbrydereer
ude af funktion. Undgå udsættelse for stråling.
This Compact Disc player is classified as a CLASS 1
LASER product.
The CLASS 1 LASER PRODUCT label is located on the
rear exterior.
CLASS 1
LASER PRODUCT
KLASSE 1
LASER PRODUKT
LUOKAN 1
LASER LAITE
KLASS 1
LASER APPARAT
Precaution to replace Optical block
(KSM-213RSCM)
Body or clothes electrostatic potential could
ruin laser diode in the optical block. Be sure
ground body and workbench, and use care
the clothes do not touch the diode.
1) After the connection, remove solder shown in
right figure.
CD PICK-UP Assy PWB
Solder
Solder


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-5-
NOTE ON BEFORE STARTING REPAIR -1/2
1. Forced discharge of electrolytic capacitor of power supply block
When repair is going to be attempted in the set that uses relay circuit in the power supply block, electric potential is kept charged across the
electrolytic capacitors (C101, 102) even though AC power cord is removed. If repair is attempted in this condition, secondary defect can occur.
In order to prevent the secondary trouble, perform the following measures before starting repair work.
Discharge procedure
1 Remove the AC power cord.
2 Connect a discharging resistor at an end of lead wire that has
clips at both ends. Connect the other end of the lead wire to
metal chassis.
3 Contact the other end of the discharging resistor to the
positive (+) side (+VH) of C101. (For two seconds)
4 Contact the same end of the discharging resistor as step 3 to
the negative (-) side (-VH) of C102 in the same way.
(For two seconds)
5 Check that voltage across C101 and C102 has decreased to
1 V or less using a multimeter or an oscilloscope.
Select a discharging resistor referring to the following table.
Note: The reference numbers (C101, C102) of the electrolytic capacitors can change depending on the models. Be sure to check the reference numbers
of the charging capacitors on schematic diagram before starting the discharging work.
2. Check items before exchanging the MICROCOMPUTER
Be sure to check the following items before exchanging the MICROCOMPUTER. Exchange the MICROCOMPUTER after confirming that the
MICROCOMPUTER is surely defective.
2-1. Regarding the HOLD terminal of the MICROCOMPUTER
When the HOLD terminal (INPUT) of the MICROCOMPUTER is "H", the MICROCOMPUTER is judged to be operating correctly.
When this terminal is "L", the main power cannot be turned on. Therefore, be sure to check the terminal voltage of the HOLD terminal before
exchange.
When the MICROCOMPUTER is not defective, the HOLD terminal can also go "L" when the POWER AMPLIFIER has any abnormalities
that triggers the abnormality detection circuit on the MAIN C. B. that sets the HOLD terminal to "L".
· Good or no good judgement of the MICROCOMPUTER
1 Turn on the AC main power.
2 Confirm that the main power is turned on and the HOLD terminal of the MICROCOMPUTER keeps the "H" level or not.
3 When the HOLD terminal is "L" level, the abnormality detection circuit is judged to be working correctly and the MICRO
COMPUTER is judged to be good.
Fig-1
MAIN C.B
D101
C101
C102
3
4
2
2
Charging voltage (V)
Discharging
Rated power (W)
Parts number
(C101, 102)
resistor ( )
25-48
100
3
87-A00-247-090
49-140
220
5
87-A00-232-090